SysStat Nano is a great little system
monitoring widget (similar to MiniStat 2) that
gives you a quick, birds-eye view of various system statistics. Your processor, used memory, hard drive usage, IP and
(very handy) external IP, amongst other things, are all at the press of a key.
While SysStat Nano offers an overview of various stats (pictured), it doesn't offer quite as much information as the aforementioned MiniStat 2. Either way, it's a darn handy widget, doesn't seem to hog too many cycles and, best of all, it's free.